KR20160102423A - Method for producing absorbent article - Google Patents

Abstract

[PROBLEMS] To easily process a concave groove, to form a concave groove neatly, and to improve the spreadability of a body fluid without deteriorating the mounting feeling.
The absorbent article according to the present invention is characterized in that a concave groove or slit-like absorber concave or convex concave groove is formed between the liquid-pervious topsheet 3 and the backsheet 2 along the longitudinal direction of the skin- The absorber 4 in which the absorber 20 is formed is interposed and the absorber recess 20 is formed inside the absorber recess 20 by embossing from the surface side of the liquid- A method of manufacturing an incontinence pad (1) having an embossed portion (21) formed along a longitudinal direction of an absorbent core (1), comprising the first step of forming the absorbent body (4) A second step of applying a core embossing 23 to both sides of the absorber 4 by pressing from the skin contact surface side of the absorber 4; ) To form the embossed portion (21) It is included.

Description

[0001] METHOD FOR PRODUCING ABSORBENT ARTICLE [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an absorbent article used mainly for an incontinence pad, a sanitary napkin, a secretion sheet, a medical pad, a toilet paper, a disposable diaper and the like, ≪ / RTI >

BACKGROUND ART [0002] Conventionally, as an absorbent article, an absorbent body is interposed between a liquid-impervious backsheet such as a polyethylene sheet or a polyethylene sheet laminate nonwoven fabric and a liquid-pervious topsheet such as a nonwoven fabric or a liquid-pervious plastic sheet.

Numerous improvements have been made to these types of absorbent articles, and various means for preventing body fluid leakage have been proposed. As one of these means for preventing fluid leakage, there is a technique of forming a concave groove by thermal embossing. For example, in the following Patent Document 1, for the purpose of increasing the absorbent / retaining property of a liquid or the like and rapidly transferring a once absorbed liquid or the like to the inside of the absorbent body to suppress or prevent backflow or leakage of liquid or the like, The upper and lower absorbent members have a depressed portion extending in the longitudinal direction formed on the skin contact surface side and the depressed portion is an opening portion penetrating the upper absorbent body to form the bottom surface of the opening portion And the lower layer absorbent is positioned on a lower surface of the upper layer absorbent. In Patent Document 2, embossing is performed along the three-dimensional gathers near the inside of the three-dimensional gathers of the absorber and also on the use side of the absorber, thereby suppressing the swelling of the absorber near the three- A female incontinence pad is disclosed. In addition, in Patent Document 3, a liquid-pervious topsheet made of a sheet or a nonwoven fabric having a plurality of openings is provided, center embosses on concave grooves provided on the absorbent body from the top surface of the liquid-pervious topsheet, Wherein the center emboss is provided with the side embossing, and the embossing processing of the center emboss is performed in the subsequent step, so that in the center embossing portion, the liquid- In which a concave groove is formed and the center emboss processing portion is enlarged in the opening of the topsheet or the fiber gap of the nonwoven fabric is enlarged.

Japanese Laid-Open Patent Publication No. 2009-112590 Japanese Patent Application Laid-Open No. 2005-87655 Japanese Patent Publication No. 4652626

In the absorbent article described in Patent Document 1, the upper absorbent body is laminated on the lower absorbent body, and a part of the surface side of the lower absorbent body (the bottom face of the opening) is in direct contact with the surface sheet directly at the opening. At least a part of the bottom surface of the opening portion of the lower layer absorbent body is joined to a part of the surface sheet introduced into the lower layer absorbent body through the opening portion by the melt adhesion method.

As described above, when a part of the surface sheet is introduced into the inside of the opening by the pressure from the surface side of the topsheet and is joined to the bottom surface of the opening of the bottoms absorbent, the following problems have arisen. (1) a problem that the side wall of the opening portion is collapsed inward due to sandwiching of the absorber between the rolls during the line conveyance of the absorber, and the absorber that collapses at the time of pressing the topsheet is also pressed simultaneously; (2) And a problem that the opening and press position are difficult to be aligned with each other and a part of the absorber around the opening portion is pressed, and the like, so that a uniform product can not be manufactured.

In order to solve such a problem, it is possible to consider measures to increase the opening of the absorber beforehand. However, it is necessary to increase the apparent weight of the absorber around the opening to compensate for the amount of absorption by increasing the size of the opening. There is a possibility that the mounting feeling may be deteriorated.

In the case where the liquid-absorbent surface sheet is laminated on the surface side of the absorbent body in advance and the embossing is carried out by pressing from the surface side of the liquid-pervious top sheet with respect to the inside of the concave groove, The side wall of the concave groove may collapse inwardly as the bottom of the concave groove is squeezed. As a result, the volume of the concave groove is reduced and the amount of body fluid that can be stored is reduced.

On the other hand, the body fluid temporarily stored in the opening penetrates into the absorber even from the side wall of the opening, but if the density of the absorber around the opening is uniform, the body fluid permeating into the absorber from the side wall of the opening tends to stagnate, There is a fear that the absorbed amount of the absorbent is immediately filled up and the absorbed amount can not be further absorbed.

However, as disclosed in Patent Document 3, there has been a technique of enlarging a large number of openings formed in the liquid-pervious topsheet by embossing, but there is a technique of enlarging the openings of the recesses formed in the absorber Did not do it.

SUMMARY OF THE INVENTION It is therefore a principal object of the present invention to provide a method of manufacturing an absorbent article which can easily process a concave groove and can form a concave groove neatly and improve the diffusibility of a body fluid without deteriorating the mounting feeling .

According to a first aspect of the present invention, there is provided an absorbent article comprising a liquid-pervious topsheet and a backsheet, wherein the absorbent article has a concave groove or a slit-like absorptance along the lengthwise direction of the skin- There is provided a method of manufacturing an absorbent article having an absorbent body having a concave portion interposed therebetween and having an embossed portion formed along the absorbent body recess inside the absorbent body recess by embossing from the surface side of the liquid-

A first step of forming the absorber having the absorber recessed portion, a second step of performing core embossing at least on both sides of the absorber recess by pressing from the skin abutment side of the absorber, And a third step of forming the embossed portion by laminating the liquid-pervious topsheet on the side of the absorbent article.

In the invention according to the first aspect of the present invention, an absorbent body having concave groove-shaped or slit-shaped absorbent body recesses formed by compression bonding along the longitudinal direction of the skin contact surface side including the body fluid discharging portion between the liquid- And an embossed portion is formed along the absorber recess in the absorber recess by embossing from the surface side of the liquid-pervious topsheet. In such an absorbent article, by forming the absorbent body recess in the absorbent body in advance when the body fluid infiltrates into the absorbent body recess and the polymer or pulp around the absorbent body recess expands, the polymer or pulp becomes high density by compression The increase in the bottom surface of the absorbent core concave portion is suppressed to be very small and the expansion of the side surface of the absorbent core concave portion is suppressed to be small since the embossing portion intervenes the liquid-pervious topsheet in the absorbent core concave portion. Therefore, it is possible to prevent the absorbent body from being deteriorated by clogging the absorbent body recess by the expanded polymer or pulp during absorption. On the other hand, when the absorber concave portion is formed in a slit shape, since the absorber does not intervene on the bottom surface of the absorber concave portion, the bottom surface does not expand.

In manufacturing such an absorbent article, the present invention includes a first step of forming the absorbent body having the absorbent body recesses, and a step of pressing the core embossed body at least on both sides of the absorbent body recesses from the skin- And a third step of laminating the liquid-pervious topsheet on the surface side of the absorbent body to form the embossed portion. By performing core embossing in the second step, both side walls of the absorber recess are pulled out by being attracted to the core embossment, so that the opening of the absorber recess is largely opened. Therefore, when the embossed portion is formed from the surface side of the liquid-pervious topsheet in the third step, the front end of the embossing device is likely to enter the inside of the absorbent core recess, and the alignment of the absorbent core and the embossing device So that the concave groove can be easily processed and the concave groove can be neatly formed without pressing unnecessary portions.

Further, since the concave groove can be formed without increasing the opening dimension of the absorbent core recess, it is not necessary to increase the apparent weight or thickness of the absorbent core, and the mounting feeling of the absorbent core can be maintained.

In addition, when the body fluid temporarily stored in the absorbent core recess penetrates into the absorbent core, the body fluid is liable to be attracted to the core embossed side due to the density gradient of the fiber, because the core embossed in the periphery of the absorbent core recess is formed. The diffusibility of the body fluid is improved and the absorption performance is improved.

According to Claim 2 of the present invention, there is provided a method of manufacturing an absorbent article according to Claim 1, wherein the core emboss is carried out in a range of 10 mm or more and 30 mm or less from the edge portion of the absorbent core concave portion.

In the invention according to claim 2, the distance from the edge of the absorber concave portion is set within a range of 10 mm or more and 30 mm or less as a position for forming the core embossment. When the core embossment is formed in a range closer to 10 mm, the height (depth) of the absorber recessed portion is pulled by the core embossing, the volume of the recessed groove is reduced, and the absorption performance may be lowered. In addition, when it is formed in a range farther than 30 mm, the effect of collapsing the side wall of the concave portion of the absorber to the outside can not be expected so much.

The invention according to claim 3, wherein the planar shape of the core embossment is one or a plurality of sets of continuous lines, discontinuities, dots or lattice-like patterns along the longitudinal direction of the absorbent article A method of making an absorbent article is provided.

In the invention according to the third aspect, it is preferable that a planar shape of the core emboss is one or a plurality of sets of continuous lines, discontinuous lines, dots or lattice patterns along the longitudinal direction of the absorbent article. The continuous line or the discontinuous line may be a straight line or a curved line such as an arc.

According to claim 4 of the present invention, there is provided a method of manufacturing an absorbent article according to any one of claims 1 to 3, wherein the core emboss is applied to the front and rear sides of the absorbent core recess.

According to the fourth aspect of the invention, since the core emboss is applied to both the front side and the rear side of the absorbent core concave portion, it is possible to improve the diffusibility from the concave groove to the front side and back side of the body fluid infiltrating into the absorbent core, And becomes even better.

According to claim 5 of the present invention, the core emboss is formed continuously or discontinuously from the side of the absorber concave portion toward the outer side as viewed in a plane, and is set so that the compression pressure on the outer side gradually increases There is provided a process for producing an absorbent article as set forth in any one of [1] to [4].

In the invention according to claim 5, when the core embossment is formed continuously or discontinuously from the side of the absorber concave portion toward the outer side as viewed in a plan view, the pressing force on the outer side is set to gradually increase The density gradient of the absorbent body gradually increases toward the outer side, so that the body fluid becomes more diffusible and the absorption performance is improved.

As described in detail above, according to the present invention, the concave groove can be easily processed, the concave groove can be formed neatly, the mounting feeling does not deteriorate, and the diffusibility of the body fluid can be improved.

1 is a partially exploded view of the incontinence pad 1 according to the present invention.
2 is an II-II line arrow in Fig.
3 is an arrow line III-III in Fig.
4 is a cross-sectional view of the absorber 4. Fig.
5 (A) to 5 (C) are cross-sectional views showing a manufacturing process of the incontinence pad 1.
6 is a plan view of the absorber 4. Fig.
Figs. 7 (A) to 7 (D) are plan views of the absorber 4. Fig.
Figs. 8 (A) to 8 (D) are plan views of the absorber 4. Fig.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[Basic configuration of incontinence pad (1)]

1 to 3, the incontinence pad 1 according to the present invention comprises a liquid-impervious backsheet 2 made of a polyethylene sheet or the like, a liquid-pervious topsheet 3 for rapidly permeating urine or the like, An absorbent body 4 made of a sheet pulp or synthetic pulp interposed between the two sheets 2 and 3 and a hydrophilic body 4 disposed between the liquid-pervious topsheet 3 and the absorbent body 4, The absorbent article according to the first aspect of the present invention comprises a second sheet 6 and an absorbent core 4 which are formed by projecting substantially the side edge portion of the absorbent body 4 to the skin side in a predetermined section in the longitudinal direction, And side nonwoven fabrics 7 and 7 forming a pair of left and right solid gathers BS and BS. In the vicinity of the absorber 4, Liquid-impervious backsheet 2 and the liquid-pervious topsheet 3 are joined together by means of an adhesive such as hot-melt adhesive or heat sealing or the like, The backsheet 2 and the side nonwoven fabric 7 are bonded together by an adhesive such as hot melt or an adhesive such as a heat seal. The absorbent body 4 may be surrounded by a wrapped sheet made of a crepe, a nonwoven fabric or the like, for the purpose of maintaining shape and improving diffusibility.

Hereinafter, the structure of the incontinence pad 1 will be described in more detail.

The liquid-impervious backsheet 2 is made of at least water-repellent sheet material such as polyethylene or polypropylene. In addition, the liquid-impervious backsheet 2 is secured to the nonwoven fabric sheet (in this case, waterproof A film and a nonwoven fabric constitute a liquid-impermeable backsheet). In recent years, there is a tendency that moisture permeability is preferably used from the viewpoint of preventing wetness. A porous sheet obtained by melt-kneading an inorganic filler in an olefin resin such as polyethylene or polypropylene to form a sheet, and then stretching the sheet in a uniaxial or biaxial direction is preferably used as the aeration / moisture-permeable sheet material.

Next, as the liquid-pervious topsheet 3, a porous or non-porous nonwoven fabric or porous plastic sheet is preferably used. Examples of the material fibers constituting the nonwoven fabric include synthetic fibers such as olefinic, polyester, and polyamide fibers such as polyethylene and polypropylene, natural fibers such as regenerated fibers such as rayon and cupra, And a nonwoven fabric obtained by a suitable processing method such as a spun lace method, a spun bond method, a thermal bond method, a melt blown method or a needle punch method can be used. Among these processing methods, the spun lace method is excellent in that it is rich in flexibility and drape property, and the thermal bond method is superior in terms of bulk and softness.

The absorbent body 4 is composed of, for example, absorbent fibers such as fluff-like pulp and a super absorbent polymer 8, and in the illustrated example, the planar shape is a longitudinally elongated generally elliptical shape that is long in the pad longitudinal direction. The superabsorbent polymer 8 becomes, for example, a granular powder and is dispersed and incorporated into the pulp constituting the absorbent article 4. [

Examples of the pulp include cellulose fibers such as chemical pulp and soluble pulp obtained from wood, artificial cellulose fibers such as rayon and acetate, and softwood pulp having a longer fiber length than hardwood pulp, . In this incontinence pad 1, since the absorbent body 4 is surrounded by the feces sheet 5, the feces sheet 5 is interposed between the liquid-pervious topsheet 3 and the absorbent body 4, The body fluid can be quickly diffused by the excellent poultice sheet 5 and backflow of urine and the like can be prevented. The apparent weight of the pulp is preferably 100 g / m2 to 600 g / m2, more preferably 200 g / m2 to 500 g / m2.

Examples of the highly water-absorbent polymer (8) include polyacrylate crosslinked products, self crosslinked polyacrylic acid salts, saponified products of crosslinked acrylic acid ester-vinyl acetate copolymers, crosslinked isobutylene / maleic anhydride copolymers, poly Sulfonic acid salt bridges, and partially crosslinked water-swellable polymers such as polyethylene oxide and polyacrylamide. Of these, acrylic acid or acrylic acid salt-based ones having excellent absorption and absorption rates are preferable. In the production process, the absorption capacity (absorption magnification) and the absorption rate can be adjusted by adjusting the cross-link density and the cross-link density gradient. The apparent weight of the polymer is preferably 150 g / m2 to 500 g / m2, more preferably 200 g / m2 to 450 g / m2.

The absorber 4 may be mixed with synthetic fibers. Examples of the synthetic fibers include polyolefins such as polyethylene or polypropylene, polyesters such as polyethylene terephthalate and polybutylene terephthalate, polyamides such as nylon, and copolymers thereof. Or a mixture of these two species. Further, composite fibers such as core / sheath type fibers, side-by-side type fibers and split type fibers having a core having a high melting point and a core having a low melting point can be also used. It is preferable that the synthetic fibers are subjected to a surface treatment with a hydrophilic agent so as to have affinity for body fluids and hydrophobic fibers.

The secondary sheet 6 may be any one having hydrophilicity with respect to body fluids. Concretely, it is possible to use a material having hydrophilicity in itself by using natural fibers such as regenerated fibers such as rayon and cupra, cotton or the like, or by using synthetic resins such as olefins, polyesters, polyamides, etc. such as polyethylene or polypropylene Fibers having hydrophilicity imparted by surface treatment of the fibers with a hydrophilic agent can be used. The secondary sheet 6 may have a porous film layer on the back surface side (on the side of the absorber 4) or may be made of a material containing pulp so as to have a stiffness.

Side nonwoven fabrics 7 and 7 are formed on both sides of the front side of the incontinence pad 1 along the longitudinal direction and over the entire length of the incontinence pad 1, The liquid impervious backsheet 2 is extended laterally and the portions of the side nonwoven fabric 7 and the liquid impervious backsheet 2 extending to the side portions are joined together by hot melt adhesive or the like, Respectively.

As the side nonwoven fabric 7, a water-repellent nonwoven fabric or a hydrophilic-treated nonwoven fabric can be used in terms of important functions. For example, if you are concerned about preventing urine from penetrating or enhancing touch, use water-repellent nonwoven fabrics such as SSMS, SMS, SMMS, etc. coated with silicone, paraffin, alkylchromic chloride water repellent If the absorbency of body fluids is important, a method of polymerizing a compound having a hydrophilic group during the production of synthetic fibers, for example, an oxidation product of polyethylene glycol or the like, or a method of treating with a metal salt such as stannic chloride It is preferable to use a hydrophilic-treated nonwoven fabric in which the synthetic fibers are made swellable or porous by a method of partially dissolving the surface to make porous and depositing hydroxides of the metal or the like, and applying hydrophilicity by applying capillary phenomenon. As such side nonwoven fabric 7, those formed of natural fibers, synthetic fibers, regenerated fibers or the like and formed by appropriate processing methods can be used.

The side nonwoven fabrics 7 and 7 are folded appropriately and include a pair of left and right inner three-dimensional gathers 10 and 10 rising up toward the skin side with a position near the substantially side edge of the absorbent 4 as a standing base, A pair of left and right outer solids standing up toward the skin formed by the liquid-impervious backsheet 2 and the side nonwoven fabric 7, which are located outside the inner three-dimensional gathers 10 and extend laterally from the absorbent body 4, And forms a three-dimensional gauze (BS) having a two-layered gath- er structure composed of gathers (11, 11). The three-dimensional gathers BS may be a one-fold gathers structure composed of only the inner three-dimensional gathers 10 or the outer three-dimensional gathers 11, It may not be formed in a gaseous phase.

The structure of the inner three-dimensional gathers 10 and the outer three-dimensional gathers 11 will be described in more detail. As shown in Fig. 2, the side nonwoven fabric 7 is folded back (7a, 7b) are formed on the inner side in the width direction and on the outer side in the width direction, respectively, and in the widthwise inner side of the double sheet portion (7a) One or a plurality of yarn elastic stretchable members 12 are arranged and a suitable position in both ends or in the longitudinal direction is fixed inside the double sheet portion 7b on the outside in the width direction And a base end portion of the double sheet portion 7a on the inner side in the width direction is arranged and formed on the side of the absorbent body 4, Permeable table Liquid-impervious backsheet 2 which is bonded to the upper surface of the sheet 3 by hot-melt adhesive or the like and in which the proximal end of the double sheet portion 7b on the outer side in the widthwise direction extends laterally from the absorbent body 4, The inner three-dimensional gathers 10 which rise up toward the skin side are formed by the double sheet portion 7a on the inner side in the width direction by the hot melt adhesive or the like, And an outer solid gathers 11 that rise toward the skin side are formed. As shown in Fig. 3, at both ends of the side surface of the side nonwoven fabric 7 in the longitudinal direction of the pad, the yarn-shaped elastic stretchable members 12 and 13 are not arranged, The sheet portion 7a is bonded to the absorbent body 4 side by a hot-melt adhesive or the like.

[Regarding the recessed groove 22]

In the incontinence pad 1, concave grooves 22 for introducing body fluids are formed on the surface side of the incontinence pad 1 along the longitudinal direction. The concave groove 22 receives the body fluid discharged to the surface of the liquid-pervious topsheet 3, temporarily stores the body fluid, induces diffusion of the body fluid in the anteroposterior direction, And to prevent the body fluid from leaking sideways at a faster rate of absorption.

The concave groove 22 is formed by previously forming the concave groove or slit-like absorber recess 20 in the absorber 4 along the longitudinal direction of the skin contact surface side including the body fluid discharge portion, By the embossing from the surface side (skin contact surface side) of the liquid-pervious topsheet 3 in the state that the liquid-pervious topsheet 3 and, if necessary, the secondary sheet 6 are laminated, 20 by forming the embossed portion 21 along the absorber recess 20.

Before forming the embossed portion 21, the absorber 4 is formed with an absorber concave portion 20 in advance not by pressing. The absorber concave portion 20 is formed on the surface of the absorber 4 on the skin contact surface side (the liquid-pervious topsheet 3 side) and on the non-skin contact surface side (the liquid- ) Recessed groove portion having a bottom surface. The absorber concave portion 20 may be formed in a slit shape penetrating from the skin contact surface side of the absorber 4 to the non-skin contact surface side, instead of the non-penetration type. The absorber concave portion 20 is formed by pressing the lower layer absorber 4a (see FIG. 4) formed by the lamination of the fibers (A) or the thickness of the bottom portion of the absorber recess 20 And an upper layer absorber 4b having a portion corresponding to the absorber recess 20 opened.

As shown in Fig. 1, it is preferable that the absorber concave portion 20 is formed only in the middle portion in the longitudinal direction of the absorber 4 as a central portion in the pad width direction corresponding to the body fluid discharging portion (H) However, a plurality of trenches may be formed at intervals in the width direction of the pad, or may be formed in a discontinuous line shape (not shown) spaced apart in the pad longitudinal direction. When a plurality of absorber recesses 20 are formed, it is preferable that the embossed portions 21 are formed with respect to the respective absorber recesses 20.

It is preferable that the length of the absorber recess 20 in the length direction of the pad is 100 to 180 mm and the groove width (groove width of the bottom surface) is 5 to 30 mm. When the absorber concave portion is formed in a concave groove shape, the depth of the absorber concave portion 20 is preferably 50% or more of the thickness of the absorber 4.

A part of the absorbent body 4 disposed on the bottom portion (the liquid-impervious backsheet 2 side portion and the non-skin side portion) of the absorbent core recess 20 has an apparent weight of pulp in a range of 70 to 210 g / , Preferably 90 g / m 2 to 190 g / m 2, and the apparent weight of the polymer is preferably 60 g / m 2 to 200 g / m 2, preferably 80 g / m 2 to 180 g / m 2 Do.

2, the concave groove 22 is formed in the absorber concave portion 20 by the embossing from the skin contact surface side of the liquid-pervious topsheet 3, The embossed portion 21 is formed.

The embossed portion 21 is provided on the surface of the absorbent body 4 facing the skin surface of the liquid-pervious topsheet 3 in a state in which the liquid-pervious topsheet 3 and, if necessary, the secondary sheet 6 are laminated on the skin- Is formed integrally with the liquid-pervious topsheet (3) and the secondary sheet (6) by pressing from the skin contact surface side. When the absorbent body 4 is surrounded by the poultice sheet, the embossed portion 21 is formed by pressing only the poultice sheet from the skin contact face side of the poultice sheet in the state in which the absorbent body 4 is surrounded by the poultice sheet, The liquid-pervious topsheet 3 and the secondary sheet 6 are laminated and the liquid-pervious topsheet 3 and the secondary sheet 6 are pressed together by pressing from the skin- Or by laminating the liquid-pervious topsheet 3 and, if necessary, the secondary sheet 6 in a state of surrounding the absorbent body 4 with the poultice sheet, the liquid-pervious topsheet 3, The topsheet 3, the secondary sheet 6, and the papermaking sheet may be integrally compressed by pressing from the skin contact surface side of the topsheet 3, the secondary sheet 6, and the papermaking sheet.

It is preferable that the planar dimension of the embossed portion 21 is made substantially equal to the dimension of the absorbent core recess 20. Concretely, it is preferable that the width dimension of the embossed portion 21 is set to about 0 to -2 mm in the difference from the groove width (width dimension of the bottom portion) of the absorber recess 20. On the other hand, the rectangular dimension of the embossed portion 21 is preferably 5 mm to 20 mm shorter than the rectangular dimension of the absorber recess 20 because the deviation in the machine is large. A high-pressure bonding portion, which is pressed more deeply than the bottom surface of the peripheral concave groove 22, may be formed on the bottom surface of the embossed portion 21 in an appropriate pattern.

By forming the concave groove 22, the following effects are obtained. When the body fluid infiltrated into the concave groove 22 penetrates the absorbent body 4 and the polymer or pulp around the absorbent body recess 20 absorbs and expands, the absorbent body recess 20 is formed in advance in the absorbent body 4 The height of the bottom surface of the absorbent core recess 20 is suppressed to be very small as compared with the case where the polymer or pulp is made high in density by the compression bonding and the inside surface of the absorbent core 20 is filled with the embossed portion 21 Since the liquid surface sheet 3 is interposed, the expansion of the side surface of the absorbent core recess 20 is also suppressed to be small. Therefore, it is possible to prevent the absorptive body 10 from being deteriorated in absorbency by clogging the absorbent core recess 20 by polymer or pulp expanded during absorption. On the other hand, in the case where the absorber concave portion 20 is formed in a slit shape, since the absorber does not intervene on the bottom surface of the absorber concave portion 20, the bottom surface does not expand during absorption.

[Manufacturing method of incontinence pad (1)]

In this document, a method of forming the concave groove 22, which is a characteristic part of the present invention, will be described in detail in the production method of the incontinence pad 1.

(First step)

First, in the first step, as shown in Fig. 5 (A), the absorber 4 having the absorber recess 20 is formed by the fiber lamination or lamination structure shown in Fig. 4 described above do.

(Second Step)

Next, in the second step, as shown in Fig. 5 (B), at least the both sides of the absorber recess 20 are pressed with the skin abutting surface side of the absorber 4, (23). The core embossing 23 may be performed on the absorbent body 4 before the absorbent body 4 is surrounded by the poultice sheet before the poultice sheet is wrapped around the absorbent body 4, Or by pressing the papermaking sheet from the skin contact surface side. The core embossment 23 can be formed in various forms. The core embossment 23 will be described later in detail.

5 (B), the fibers are pulled toward the inside of the core embossment 23, so that they are attracted to the core embossment 23 and the absorbent core recesses 20 Are inclined to the outside, so that the opening of the absorber concave portion 20 is largely opened.

(Third step)

5C, a liquid-pervious topsheet 3 and, if necessary, a liquid-impervious backsheet 3 on the skin-contacting surface side of the absorbent article 4 on which the core embossment 23 is applied, as a third step, The sheet 6 is laminated and the embossed portion 21 is formed along the absorber recess 20 in the absorber recess 20.

At this time, since the opening of the absorber concave portion 20 is largely opened by performing the core embossing 23 in the second step, the front end portion of the embossing device when the embossing portion 21 is formed is, The unnecessary portion of the absorber 4 can be properly entered into the absorber recess 20 without being squeezed. Therefore, the positioning of the absorber 4 and the embossing device is facilitated, the concave groove 22 is easily processed, and the concave groove 22 can be formed neatly without pressing unnecessary portions.

[Core emboss (23)]

It is preferable that the core embossment 23 is disposed at a position spaced apart from the absorber recess 20 by a predetermined distance. Specifically, as shown in Fig. 6, the distance from the edge of the absorber concave portion 20 is set within a range of 10 mm or more and 30 mm or less, preferably 10 mm or more and 25 mm or less. When the core embossment 23 is carried out in a range in which the distance from the absorber recess 20 is smaller than 10 mm, that is, in a hatched range in the drawing, the core embossment 23 is pulled by the core embossment 23, The depth of the concave groove 22 (the depth of the concave portion 20) of the concave groove 22 is reduced, and thus the volume of the concave groove 22 is reduced and the absorbing performance of the body fluid may be deteriorated. On the other hand, if it is formed in a range farther than 30 mm, the effect of collapsing the sidewall of the absorber concave portion 20 outwardly can not be expected to be expected. The distance from the edge of the absorber recess 20 is the length at the shortest straight line distance from the edge of the core emboss 23 to the edge of the absorber recess 20.

The planar shape of the core embossment 23 can be formed in various patterns. In the example shown in Fig. 1, on both sides of the absorber concave portion 20, a pair of continuous straight line patterns are formed along the pad length direction including the absorber recess 20 and a range overlapping the pad width direction . The absorber concave portion 20 is opened over the entire length by forming the absorber concave portion 20 in a length equal to or longer than the length of the absorber concave portion 20 including the range overlapping the pad width direction.

In the example shown in Fig. 1, the straight line pattern extends to the middle in the longitudinal direction of the absorber 4, but it can also be formed over the entire length of the absorber 4 as shown in Fig. 7 (A). This makes it possible to improve the diffusibility of body fluids from the central portion to the core embossment 23 side over the entire length of the absorbent body 4. [

1, a pair of core embossments 23 are formed on both sides of the absorber recess 20. However, as shown in Fig. 7 (B), a plurality of pairs of the core embossings 23 may be formed apart from each other in the pad width direction. In the illustrated example, three sets are formed. In the case of forming them in a plurality of sets, they may be formed to have the same length, or may be formed such that the inner core embossment 23 is gradually shortened both before and after, as shown in the drawing. However, at least one set of core embossments 23 has a length overlapping the pad width direction over the entire length of the absorber recess 20. By forming a plurality of core embossings 23, the absorber concave portion 20 is more reliably opened and the compaction area is formed over a wider range, so that the body fluid diffusibility is further improved. In order to facilitate the effect of pulling both side walls of the absorber concave portion 20 outward, it is preferable that the outer side (outer side) of the core embosses 23, 23, One set may be formed in the order from the core embossment 23 located at the inner side toward the inner side.

7 (C), the core embossing 23 may be formed in a discontinuous line pattern in which a plurality of pressed portions and non-crimped portions are arranged alternately in the pad longitudinal direction. In this pattern, although the effect of opening of the absorbent core recess 20 by compressing and the effect of body fluid diffusion is somewhat reduced, the strength of the absorbent core due to the formation of the core embossment 23 is suppressed.

The core embossment 23 may be formed in a curved pattern as shown in Fig. 7 (D). In the illustrated example, it is formed in an arc pattern that bulges toward the inside. In the illustrated example, the regions continuous to the end portions in the pad width direction are pressed over the entire surface, but they may be formed in one or a plurality of sets of curved patterns substantially along the pad longitudinal direction.

7 (D), the core embossing 23 may be squeezed over the entire surface in a region continuous to the end portion in the pad width direction. As a result, the effect of the core embossing 23 can be more clearly demonstrated, and both sides of the absorber 4 can be thinned, resulting in improved wearing feeling.

Although not shown, the core embossed pattern 23 may include a dot-like pattern in which a plurality of dots are given to a predetermined area, a lattice pattern in which a plurality of pad longitudinal direction lines intersect with a pad width direction line, Pattern can be formed.

The core embossment 23 can be applied not only to both sides of the absorber recess 20 but also to the front and rear sides of the absorber recess 20 as shown in Fig. In the case of longitudinal flow in which the machine flow direction is aligned with the pad longitudinal direction, the core embossment 23 on the front and rear portions of the absorber recess 20 has a large machine deviation in the longitudinal direction of the pad, It is not necessary to form it necessarily from the viewpoint of improvement. However, the diffusibility in the longitudinal direction of the absorbent core recess 20 is improved and the entire absorbent body can be efficiently used, so that much body fluid can be absorbed with a smaller amount of pulp or polymer It is preferable to form the core embossment 23 in this portion as well.

As shown in Fig. 8, the planar shape of the core embossing 23 formed on the front and rear portions of the absorber concave portion 20 is a circular arc shape in which the front and rear end edges of the core embossment 23 are bulged outwardly in the pad longitudinal direction, (B) a pattern consisting of one or a plurality of curved lines extending along the pad width direction and toward the outer side in the pad longitudinal direction, (C) a pattern formed by pressing the pad length (D) a pattern in which a plurality of crimping portions are arranged in a zigzag or lattice pattern with intervals in the direction of the width and the width direction, (D) And a plurality of straight lines extending in the pad longitudinal direction are disposed at intervals in the pad width direction so as to extend over the two sets of the circular lines .

The core embossing 23 formed on the front and rear portions of the absorbent core recess 20 may be arranged so as to be continuous with the core embossing 23 formed on both side portions of the absorbent core recess 20 )), Or may be arranged to be spaced apart.

As shown in Figs. 7 (B), 7 (D) and 8, when the core embossment 23 is continuously or discontinuously formed from the side of the absorber concave portion 20 toward the outer side, Or the compression pressure of the core embossing 23 located on the outer side may be set to be gradually higher or lower than the compression pressure of the core embossing 23 located on the inner side in a continuous or stepwise manner do. The density of the fibers gradually increasing in density toward the outer side is formed so that the diffusibility of the body fluids is further increased and the amount of the pulp or polymer is increased It is possible to effectively utilize the body fluid storage capacity of the absorber 4 as much as possible and improve the absorption performance.

1: incontinence pad, 2: impervious back sheet, 3: liquid-pervious topsheet, 4: absorber, 6: secondary sheet, 7: side nonwoven fabric, 8: superabsorbent polymer, 10: , 12 揃 13: Elastomeric elastic stretching member, 20: Absorber recess, 21: Embossed portion, 22: Concave groove, 23: Core emboss

Claims (5)

An absorbent body in which concave grooves or slit-shaped absorbent body recesses are formed is pressed between the liquid-pervious topsheet and the backsheet along the lengthwise direction of the skin contact surface side including the body fluid discharge portion, Wherein an embossed portion is formed along the concave portion of the absorbent body in the inside of the absorbent body concave portion by embossing from the surface side of the absorbent article,
A first step of forming the absorber having the absorber recessed portion, a second step of performing core embossing at least on both sides of the absorber recess by pressing from the skin abutment side of the absorber, And a third step of forming the embossed portion by laminating the liquid-pervious top sheet on the side of the absorbent article. The method according to claim 1,
Wherein the core embossing is performed in a range of 10 mm or more and 30 mm or less from the edge of the absorbent core recess. 3. The method according to claim 1 or 2,
Wherein the planar shape of the core emboss is a pattern of one or a plurality of sets of continuous lines, discontinuous lines, dots or lattices along the longitudinal direction of the absorbent article. 4. The method according to any one of claims 1 to 3,
Wherein the core embossing is carried out also on the front side and the rear side of the absorbent core concave portion. 5. The method according to any one of claims 1 to 4,
Wherein the core emboss is formed continuously or discontinuously from the absorbent core concave portion side toward the outer side and is set such that the compression pressure on the outer side is gradually increased.

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